condition mean min max ZT0-3 13.162625 13.0747 13.25055 ZT4-7 12.39505 12.39505 12.39505 ZT8-11 9.619555 9.619555 9.619555 ZT12-15 0 0 0 ZT16-19 9.46237 9.46237 9.46237 ZT20-23 13.93085 13.93085 13.93085